diff --git a/mlair/data_handler/data_handler_wrf_chem.py b/mlair/data_handler/data_handler_wrf_chem.py
index 6f1d3566c877407830b22b71919f9850d19c4dac..2c90835f070a28bd30c24e4ebcffa48fac167d4d 100644
--- a/mlair/data_handler/data_handler_wrf_chem.py
+++ b/mlair/data_handler/data_handler_wrf_chem.py
@@ -52,6 +52,8 @@ class WrfChemDataHandler(AbstractDataHandler):
 
         if rechunk_values is None:
             self.rechunk_values = {self.time_dim_name: 1}
+        else:
+            self.rechunk_values = rechunk_values
 
         # internal
         self._X = None